Monthly Debt Payment Calculator

How it works

Paying off a fixed balance by a deadline is the usual loan problem in reverse. Instead of asking how long a fixed payment takes, you set the number of months and solve for the payment.

Each month the lender adds interest at your annual percentage rate (APR), then your payment cuts the balance. The calculator finds the level monthly amount that lands exactly on zero in the window you chose:

• P — the monthly payment you are solving for
• B — the balance owed today
• i — the monthly interest rate (APR ÷ 12)
• n — the number of months you want to be paying

That one equation prices almost every fixed loan a borrower signs. It sets the payment on auto loans, on a personal loan and on federal student loans. The same maths gives the principal and interest part of a mortgage.

Credit card debt is the exception. A card only asks for a small minimum each month, so the balance can sit there for years. Setting a deadline turns that open-ended card into a loan with a real term.

With the defaults above, clearing a $9,000 card balance at 19% APR in 36 months takes about $330 a month. Roughly $2,877 of that goes to interest, for a total of about $11,877 repaid. Shorten the window and the payment rises while the interest shrinks.

The split inside each payment also shifts as you go. Early on, most of that $330 covers interest and only a little cuts the principal. An amortization schedule lists that split month by month, and by the final year almost the whole payment is principal.

✓ Every result is checked against independent reference math. See how we test the calculators →

How to use this calculator

1. Enter the balance you owe today on the card or loan, not the original amount borrowed.
2. Enter the interest rate from your statement or contract, as the APR rather than a monthly figure.
3. Set the number of months you want to be paying, then read the monthly payment.
4. Check the total interest and total repaid underneath to see what that deadline costs.
5. Step the months up or down by six and re-read the payment until it fits your budget.

A worked example: $9,000 gone in three years

A $9,000 card balance is sitting at 19% APR, and you want it gone in three years. To hit that 36 month target, you would pay $330 a month, every month, until the balance hits zero.

Over those 36 payments you hand back $11,877 in total, which means $2,877 of it is pure interest on top of what you borrowed. The higher the rate, the more of each payment feeds interest instead of shrinking the balance.

Rate is the lever here. The same $9,000 at a 7% auto loan rate would only need $278 a month, while a 22% card pushes it to $344, a spread of $66 a month on the identical balance. Plug in your real balance and rate to see your number.

How do you pick a payoff window you can keep?

The deadline is the one input you fully control. It sets both the payment and the total interest you hand the lender. So start with what your budget can carry each month, not with the date you would like.

• Work backward from what you can afford: if the payment for your target date is too high, nudge the months out until the number fits. Then commit to it.
• Shorter is cheaper: every month you cut from the deadline cuts interest, because the balance spends less time collecting it at your card's APR.
• Stop adding to the balance: this plan assumes no new charges, so a card you keep spending on resets the maths every month.
• Match the window to the debt: auto loans usually run 36 to 72 months, and student loans run far longer. Two or three years is a sensible target for credit card debt.
• Leave room for the unexpected: a payment that only works in a perfect month gets missed when a car repair or an insurance bill lands. A missed payment hurts your credit score.

The same balance across different deadlines

To see the trade-off, hold the balance and the interest rate fixed and change only the deadline. Take the default $9,000 card balance at 19% APR. Watch the payment and the total interest move in opposite directions:

• 24 months: about $454 a month, with roughly $1,900 in interest.
• 36 months: about $330 a month, with roughly $2,900 in interest.
• 48 months: about $269 a month, with roughly $3,900 in interest.
• 60 months: about $233 a month, with roughly $5,000 in interest.

Cutting the window from 60 months to 24 only doubles the payment, from roughly $233 to $454. The interest falls much further, from about $5,000 to under $1,900, a cut of well over 60%.

That tighter deadline asks for more each month, yet it costs far less overall, because the balance spends fewer months collecting interest.

So pick the shortest window whose payment you can meet, then hold it. Put your own balance and APR in above, then step the months up six at a time until the payment stops being comfortable.

How much is a $30,000 loan monthly?

It depends on the interest rate and the term, so the same $30,000 can mean very different payments. At 12% APR, a $30,000 personal loan spread over five years costs about $667 a month. Repay that same loan in 12 months and it costs about $2,665.

That 12-month version is what people mean by clearing $30,000 of debt in a single year. Paying $2,665 every month means finding close to $32,000 in money you do not currently spend. Most borrowers get there with a bonus, a sale or a second income, not by trimming ordinary costs.

Bigger balances follow the same pattern. A $100,000 loan at 6.5% over 30 years runs about $632 a month in principal and interest, the way a mortgage is normally written. Take that same $100,000 as a five-year loan at 8% and the payment is close to $2,028.

A mortgage runs that long to keep the monthly figure small. The five-year version squeezes the same principal into a much shorter stretch, so the term moves the payment far more than the rate does.

Lenders quote the monthly figure first, since that is what borrowers compare. Ask for the APR and the term written into the contract next to it.

Read the monthly payment next to the total cost

The monthly payment is the headline number, but it is only half the story. Two plans can share the same comfortable payment, yet one costs thousands more in interest because it runs longer.

• The monthly payment: what you have to cover every month, and the figure a lender checks against your income.
• The total interest: what the timeline costs you, called the finance charge on a card statement. Shrink this once the payment is affordable.
• The total repaid: principal and interest together, the figure to compare against a consolidation loan or a balance transfer offer.
• The interest rate: the APR you agreed to, which decides how much each extra month adds to the bill.
• The amortization schedule: the month-by-month split of each payment between interest and principal, the same table a mortgage lender hands over at closing.

Use those numbers together. Find the longest window you would accept, note its interest, then shorten the deadline as far as you can and watch the interest fall.

Set the payment slightly above what the deadline requires. That cushion covers a tight month, and in a normal month the extra goes straight to principal and pulls the payoff date forward.

Does a variable interest rate change the payment?

Yes, on some debts. A fixed-rate car loan or personal loan locks the rate in for the whole term. So the payment you work out here holds to the end.

Credit cards are different. Most card APRs are variable rates tied to the prime rate, which moves whenever the U.S. Federal Reserve changes its target. Older loans and business credit lines were often tied to the London Interbank Offered Rate (LIBOR), before that benchmark was retired.

Adjustable-rate mortgages reset on a schedule too, as do a home equity line of credit (HELOC) and some home equity loans. A HELOC often charges interest only at first, so the balance barely falls.

When a variable rate rises, your fixed payment clears less principal and the deadline slips. A variable rate that drops works the other way, and the same payment finishes the debt early.

Lenders have to tell you before a new rate applies, and the finance charge on the next statement will show it. So re-run the numbers at the higher APR and lift the payment to keep the date.

What if you cannot afford the payment?

Stretching the deadline is the first move, but it only helps so far. Past a point the interest rate is the problem rather than the term, and a 19% card is where that shows up first.

• Refinancing: a fixed-rate personal loan from a bank or credit union at a lower APR can clear credit card debt, and one payment replaces several.
• A balance transfer: a promotional 0% card pauses interest for a set period, though the transfer fee and the rate after the promotion belong in the maths.
• Ordering your balances: the debt snowball method clears the smallest debt first. The avalanche puts the spare money on the highest rate and saves more overall.
• Credit counseling: a nonprofit agency can negotiate lower rates with lenders on a debt management plan. The FTC guide to how to get out of debt sets out what to check first.
• Check what you actually owe: pull your credit report from Equifax, Experian or TransUnion. A forgotten store card or medical bill will break a plan built around one balance.

Credit counseling costs little and will not hurt your credit score. A debt management plan does usually ask you to close the cards it covers.

Compare rates before borrowing again. Money in savings accounts rarely earns anything close to 19%, so moving part of that cash onto the balance usually beats leaving it there.

Whatever route you take, keep paying at least the minimum on every account. A late payment is reported to Equifax and the other bureaus, and it drags your credit score down for years.